JPH0241851Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is applied, for example, to the wire lead-out part of a neon transformer, where multiple insulated wires are covered with thermosetting resin filling and fixed in the case. This invention relates to a structure for leading out high voltage lines to the outside.

"Prior Art" In the lead-out structure of a high-voltage line, for example, it is mandatory to use a neon electric wire for the secondary outlet wire of a neon transformer according to the Electrical Appliance and Material Control Law. If the outer box is not provided with a handle, the pull-out strength of the two outlet wires at once is required to withstand three times the weight of the transformer. Conventionally, the following steps were taken to satisfy this requirement.

That is, the neon wire 10 is a double insulated wire in which a core wire 11 is coated with an insulating layer 12, and a sheath coating 13 is further applied thereon, as shown in FIG. As a simple method, winding fasteners 14a to 14c are wound onto the sheath covering 13 as shown in FIG. For example, as shown in FIG. 5, the winding and tightening tool 14 (14a to 14c are shown as representatives) has an insertion engagement part 16 fixed to one end of a band-shaped body 15. The other end side is inserted, and the insertion engagement portion 16 and the band-shaped body 15 inserted therein do not engage in the direction of insertion, that is, in the direction of winding and tightening the electric wire 10, but do engage in the direction of loosening the winding. At the same time, the wound state is maintained.

As shown in FIG. 6, the winding fasteners 14a to 14c
The tightened part is the inside of the outer box 17 of the transformer,
The electric wire 10 is led out from the secondary bushing 18 of the outer box 17. Inside the outer box 17, the electric wire 10 is wound around a bobbin (not shown) and passed through a hole 21 formed in a flange 19 of the bobbin. Near the hole 21, the winding fasteners 14a and 14b are on the opposite side of the outer box 17, and the secondary bushing 18 is also approached, and the winding fastener 14c is on the inside thereof.
are located respectively. The outer box 17 is filled with a thermosetting resin filler 22, whereby the electric wire 10 is fixed to the outer box 17 and led out.

In this way, the electric wire 10 can be easily fixed to the outer box 17. However, in a high temperature atmosphere (about 70 to 80 degrees Celsius), if a large force is applied in the direction of pulling out the electric wire 10 from the outside of the outer box 17, since the sheath coating 13 of the neon electric wire 10 is made of vinyl chloride, for example,
As shown in FIG. 7, the sheath coating 13 remains in an extended state, and the inner ends of the core wire 11 and the insulating layer 12 are cut, and the core wire 11 and the insulating layer 12 come out to the outside. In other words, although the winding and tightening tool 14 can easily perform winding and tightening, it cannot sufficiently tighten the sheath coating 13 of the electric wire to the insulating layer 12.

Therefore, conventionally, as shown in Fig. 8, the sheath coating 1
By winding a wire 23 with a low elasticity such as cotton thread many times on the insulation layer 3 and widening the winding width, the sheath covering 13 is tightened to the insulating layer 12 with sufficient strength to ensure pull-out strength. . However, winding the wire 23 around the electric wire 10 many times in this manner is very time consuming and has the disadvantage that the workability is poor and it is not suitable for mass production.

``Means for solving the problem'' According to this invention, at least the outermost coating of the multi-insulated wire inside the thermosetting resin filling is removed, and the wire is wrapped around the removed portion. The fittings are tightened. This winding fastener is also embedded within the filling.

``Example'' Figure 1 shows an example in which this invention is applied to the lead-out structure of the secondary side lead wire of a neon transformer.
Parts corresponding to those in the figure are given the same reference numerals.

In this invention, the sheath coating 13 inside the flange 19 of the winding frame of the electric wire 10 in the thermosetting resin filling 22 is removed, and the removed portion 10
Winding fasteners 14a and 14b are tightened on top of a. Furthermore, a winding fastener 14c is tightened from above the sheath 13 near the secondary bushing 18, if necessary. With these winding fasteners 14a to 14c tightening the electric wire 10, the outer box 17 is filled with thermosetting resin filling 22, and the electric wire 10 is held in the outer box 17.
Fixed.

The insulating layer 12 is made of polyethylene, and since it has little expansion and contraction change due to heat, the winding fasteners 14a and 14b can maintain sufficient tightness against the insulating layer 12 even in a high-temperature atmosphere, and the winding fasteners 14a and 14b are made of thermosetting material. The electric wire 10 is fixed to the resin filling 22 and cannot be pulled out even if it is pulled outward with a strong force.

According to experiments, the wires could not be pulled out even if two wires were pulled together under a normal test load of about 10 to 20 kg.

Note that the winding fasteners 14a to 14c are not limited to those shown in FIG. 5, but may be any other tool as long as it is capable of strongly tightening the portion other than the outermost covering with good workability.

``Effects of the invention'' As described above, according to this invention, there is no risk of the wire being pulled out due to elongation even if the wire is pulled strongly under high temperature conditions, and since the winding and tightening tool is used, the work of winding and tightening the wire is easier. can be constructed easily and inexpensively.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of this invention, Fig. 2 is a view showing the electric wire 10 and the winding fastener in Fig. 1, Fig. 3 is a sectional view showing the neon electric wire, and Fig. 4 is a FIG. 5 is a side view showing an example of a winding fastener; FIG.
The figure is a perspective view showing the electric wire shown in Fig. 4 attached to a neon transformer, Fig. 7 is a sectional view showing the state with the insulating layer and core wire removed, and Fig. 8 is an electric wire in a conventional fixed structure. FIG. DESCRIPTION OF SYMBOLS 10: Multiple insulated wire, 10a: Portion excluding outermost coating, 13: Sheath coating, 14a to 14b: Winding tightening tool, 15: Band-shaped body, 16: Insertion engagement part, 1
7: Outer box, 18: Butting, 19: Flange.

Claims (1)

[Scope of Claim for Utility Model Registration] In a high-voltage wire lead-out structure in which multiple insulated wires are covered and fixed within a case with a thermosetting resin filling and led out to the outside of the case, within the thermosetting resin filling In the above, the multiple insulated wire has a portion from which the outermost covering has been removed, and a winding fastener is tightened around the removed portion of the multiple insulated wire, and the winding fastener is also filled with the thermosetting resin. A high voltage line lead-out structure characterized by being covered by an object.